Abstract: The effects of process parameters on the efficient removal of burrs and cuts of TC4 titanium alloy hole， reduction of surface roughness R_a， and improvement of micromorphology were studied by using the built-in magnet to attract magnetic abrasive particles. Firstly， the orthogonal experiment of coaxial grinding of the magnetic pole and hole was carried out. According to the analysis of the range and variance， the effect of the magnetic pole speed， the abrasive diameter and the filling amount of abrasive on the surface roughness R_a and micromorphology were obtained， and a better combination of process parameters was determined. Secondly， the eccentric grinding test of magnetic poles and holes was carried out， and three-dimensional force testing was performed on the eccentric grinding and the test data was analyzed. The results show that:for 10mm holes of TC4 titanium alloy， a radial magnetic pole of 6mm is used， the surface burrs and cuts are removed， and the surface topography is uniform and flat after 30minutes grinding with an eccentricity of 1mm. Compared with the coaxial grinding， the surface roughness R_a is reduced by 13.7% and the grinding efficiency is increased by 25.0%.

Key words: magnetic abrasive finishing(MAF), surface roughness, orthogonal experiment, process parameters, micromorphology